package com.jiajia.server.controller;

import com.google.code.kaptcha.impl.DefaultKaptcha;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;

/**
 * 验证码Controller
 *
 * @author zhoubin
 * @since 1.0.0
 */
@RestController
public class CaptchaController {

	@Autowired
	private DefaultKaptcha defaultKaptcha;

	@ApiOperation(value = "验证码")
	@GetMapping(value = "/captcha", produces = "image/jpeg")
	public void captcha(HttpServletRequest request, HttpServletResponse response) {
		// 定义response输出类型为image/jpeg类型
		response.setDateHeader("Expires", 0);
		// Set standard HTTP/1.1 no-cache headers.
		response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
		// Set IE extended HTTP/1.1 no-cache headers (use addHeader).
		response.addHeader("Cache-Control", "post-check=0, pre-check=0");
		// Set standard HTTP/1.0 no-cache header.
		response.setHeader("Pragma", "no-cache");
		// return a jpeg
		response.setContentType("image/jpeg");

		//-------------------生成验证码 begin --------------------------
		//获取验证码文本内容
		String text = defaultKaptcha.createText();
		System.out.println("验证码为："+text);
		//将验证码放入session中
		request.getSession().setAttribute("captcha",text);
		//根据文本内容创建图形验证码
		BufferedImage image = defaultKaptcha.createImage(text);
		ServletOutputStream outputStream = null;
		try {
			outputStream = response.getOutputStream();
			ImageIO.write(image,"jpg",outputStream);
			outputStream.flush();
		} catch (IOException e) {
			e.printStackTrace();
		}finally {
			if (outputStream!=null){
				try {
					outputStream.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}

		//输出流输出图片，格式jpg

		//-------------------生成验证码 end ----------------------------
	}

}